This patch implements export key operations of three RSA algorithms
(RSASSA-PKCS1-v1_5, RSA-OAEP, RSA-OAEP), with `rsa` crate.
The three operations are very similar to each other, so we can implement
them as a single function, located at a new sub-module `rsa_common`,
shared among the three RSA algorithms. An enum `RsaAlgorithm` is also
added to the sub-module `rsa_common`, in order to slightly differentiate
the behavior of the step (Step 3.4 of "jwk" format) that are different
among the three RSA algorithms.
Testing:
- Pass some WPT tests that were expected to fail.
- Some new FAIL expectations are added. They were skipped by WPT when
the export key operations of RSASSA-PKCS1-v1_5, RSA-PSS and RSA-OAEP had
not been implemented, and requires other not-yet-implemented operations
to pass.
Fixes: Part of #41113
Signed-off-by: Kingsley Yung <kingsley@kkoyung.dev>
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